Humidifier filter



FIG. 1 is a front, top, left perspective view of a humidifier filter, showing the new design;

FIG. 2 is a front, top, right perspective thereof;

FIG. 3 is a rear, top, right perspective view thereof;

FIG. 4 is a rear, top, left perspective view thereof;

FIG. 5 is a front, bottom, left perspective view thereof;

FIG. 6 is a front, bottom, right perspective view thereof;

FIG. 7 is a rear, bottom, right perspective view thereof;

FIG. 8 is a rear, bottom, left perspective view thereof;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a right view thereof;

FIG. 12 is a left view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

Broken lines in the figures show portions of the humidifier filter that form no part of the claimed design. 

CLAIM The ornamental design for a humidifier filter, as shown and described. 